[h-e-w] TZ in Win2k

I installed Windows port of GNU rcs as instructed in the NTEmacs
website. RCS wouldn't run without setting TZ environmental
variable. What should I set TZ as (I'm in Hawaii, GMT-10:00)? I tried
GMT-10:00, HST, -10:00. The Emacs time display was way off. If
delete TZ variable, then Emacs displays time correctly, but RCS won't
start.
Help!